Condenser



Patented Sept. 12, 1933 CONDENSER Samuel Siegel, New York, N. Y., assigner to Aerovox` Wireless Corporation, a corporation of New York Application June 16, 1925., SerialNo.A 37,431

Claims.

The invention relates more especially to condensers of small and xed capacity for radio -use although it is not necessarily limited to such application.

Itis amongv the objects ofthe invention to provide a condensery of the type mentioned, which shall be easy to manufacture, of rugged construction, the capacity of Which is substantially invariant in. all conditions of handling and use,

10 which shall be susceptible of being readily mounted without the need for tools other than a screw driver, which shall not be dependent for operativeess'on exerting a clamping pressure on the pack and which shall be substantially proof against tampering. I

In a preferred form of the invention, the condenser includes a pack, preformed under pressure and heat, and consisting of a laminated series of foil sheets and dielectric sheets. This pack is confined between a pair of backing plates andthe various laminations consisting of the backing sheets and the pack are held together in a manner Which obviates the necessity for using pack penetrating rivets or similar securing devices. I preferably Wrap securing bands of bendable pack. These bands may be interlocked with the edges of the backing sheets so that accidental displacement thereof in any direction is rendered impossible. The pack is held in place without undue pressure yet firmly enough so that it can.- notslip. The possibility of altering the capacity or otherwise varying the electrical characteristics of the pack by undue pressure exerted during a riveting operation is obviated.

Although bands which are disposed upon one side of the condenser and having their ends wrapped around and overlapping the other side, may serve the purpose, I preferably utilize a cooperating pair of bands to completely encircle the device and interlock their ends, either by overlapping or crimping. In the drawing,

Figure 1 is a perspective view of a condenser embodying the invention, part being broken away for clearness; y I Figure 2 is a similar view with the positie of the condenser reversed.L y

Figure 3 is a perspective view of the band member 12;v

Figure 4 is a perspective view of one of the backing sheets; I

Figure 5 is a perspective view illustrating a modification; I

Figure 6 is an exploded view of a pair of cowhich are used to hold the backing sheets metal about the assembled backing sheets and operating interlocking bands embodying a modification Figure 7 is a perspective view of a condenser unit embodying another modication;

Figure 8 is an enlarged View in transverse section on the line 8 8 of Figure 7; and

Figure 9 is a perspective View of a modified type of locking plate.

Referring to Figs. l to 4, of the drawing, I have used the reference character 10, to desig- GJ nate the foil pack.v This pack preferably consists of a number of alternating sheets of foil and dielectric material compressed in the presence of heat in the manner and for the purpose set forth in the copending application of Samuel Siegel, Serial No. 22,933 filed April 14, 1925. The backing sheets 11 between which the packlis placed are formed of bakelite or some similar stiff light` insulating material. Preferably the ends of the pack project beyond the bakelite backing sheets and are wrapped around the edges of the same so that they are brought into firm electrical contact with the bands or straps 12 and pack in proper relationship. so

The intermediate portion of the strap lies flat against one of the backing sheets'and the ends 13'thereof are bent around the sheets and pack andv turned over `to clamp the same. The bend- 4 able ends 13 of the straps are preferably disposed L in notches 14 inthe edges of the backing sheets so that the latter are rmly locked against sliding movement relative to each other or to the pack. The ends of the straps 12 may interlock with the notched ends of complementary straps or bands 15, the latter being in the nature of flat metallic members of substantially the same length as the Width of the condensers.

Aligned openings 16 in the straps backing sheets andthe condenser pack permit the condenser to be readily attached to a support by the use of Wood screws or other conventional securing devices. i 1

I have shown in Fig. l, the straps 12 as formed with lateral angular extensions 17 adapted to abut the ends of the backing sheets and pack. 'I'hese extensions are convenient for assembly purposes in that they permit the notches 14 to be readily aligned and they also effectively prevent the turned over ends of the pack from becoming dislocated or working out of electrical contact With the straps 12.

It is frequently desirable to utilize small electrical terminals, such as the terminal clips 18 shown in Fig. 2. These clips are preferably secured to the intermediate portion of the straps 12 by drawing out the holes 16 and riveting over the drawn edges of the material surrounding the hole to clamp the clips in place.

In Fig. 5 I have shown substantially the same construction as that abovey described except that the complementarystraps 15 are omitted.

In Fig. 6.1 form the lateral angular extensions 19 on the short plate 20 instead of on the longer strap 21. The construction otherwiseV is the same as that described for Fig. 1 and the assembled device has substantially the same appearance.

In Figs. 7 and 8 I have shown a modification in which I utilize a short strap or band 25 and a cooperating longer band 26. Each band is in the nature of a narrow strip of bendable metal, band 25 being the same length as the width of the backing sheets and having upwardly turned ends 27. Band 26 on the other hand, is of general U shape, the arms 28 thereof being adapted to embrace the condenser and including terminal ends 28a which may be crimped to the upstanding ends of the band 25 as clearly indicated in crimped together, the band 25 presents inwardly turned hooked extremities of the band 26. Terminals, such for instance, as the clip 18 may be secured to either of the bands in the manner indicated in Fig. `2.

In Fig. 9 I have shown a type of securing band or plate 30 of general U shape having a lateral angular extension 31 along its intermediate portion and having a terminal 32 integral with the extension. This type of device obviates the necessity for separate terminal plates such as 18 and is otherwise generally similar to the form shown in Fig. 5. f

'It will be noted that with all forms of the in vention I eliminate the use of rivets projecting of the invention and is well suited to meet the requirements of practical use.

As many changes could be made in the above construction and many apparently widely different embodiments of this ,invention could be made without departing from the scope thereof, it is intended that all matter contained in the above description or shown in-the accompanying drawing shall be 'interpreted as illustrative and not in a limiting sense.' K

Having thus described my invention what I claim as new and desire to secure by Letters vPatent is: l

` 1. A condenser including a pair of backing I sheets of relatively stiff insulating material, a

condenser pack interposed between them, and

. cooperating band elements arranged upon opelement including bendable tongues locked in the notches.

2. A condenser including a pair of backing sheets of relatively stiff insulating material, a condenser pack interposed between them,` a securing member of general L shape having a portion overlying the face of one backing sheet and a separate member abutting the end edges of the backing sheets and condenser pack and including tongues bent around and over the condenser and locked in notches formed in the backing sheets.

3. A device of the class described in claim 2 and wherein a separate member is provided having notches therein aligning with the notches in the backing sheets and over which the ends of the tongues are bent.

4. A condenser including a pair of backing sheets of relatively stiff insulating material, a condenser pack interposed between the backing sheets, cooperating band elements disposed on opposite sides of the condenser, one of said elements being of general L shape in cross section including a fiange at one edge abutting the edges of the backing sheets and pack, the other of said elements including bendable tongues at its ends embracing the pack and engaging with notches in the ends of the cooperating element.

5. A device ofthe class described in claim 4 wherein the tongued element-is provided with a struck out opening therein adapted to be upset to secure a terminal clip in place.

6. A condenser including a pair of backing4 sheets of relatively stii insulating material, a condenser pack interposed between the sheets, a pair of cooperating metallic band elements, one of said band elements being of a length approximately equal to the width of the backing sheet which it overlie's, the other of said elements being of general U shape having its intermediate portion overlying the opposite backing sheet and its ends interlocked with the ends of the first mentioned element.

7. A condenser unit including a pair of flat backing sheets of relatively stiff insulating material, having aligned notches in their edges, a condenser pack. arranged between the sheets, said pack including alternating laminations of foil and being bent around one of the backing sheets, a securing band extending transversely about each end of the unit and retaining the backing sheets and pack in proper relationship, each of said bands including an intermediate portion overlying one backing sheet and in electrical contact with the bent over ends of the foil sheets, the ends of the bands embracing and overlying the other backing sheet and being received in said notches.

8. A condenser comprising a body, cover plate for the body, each of said plates having laterally extending projections at each corner thereof, one side of each projection being perpendicular to a -dielectric material, the ends of the foil sheets side of its plate, and clamping members on the.

ends of the condenser engaging said perpendicu-l lar sides of the projections in such manner as to be vfirmly secured in place and positively interlocking the clamping members with the cover plates.

9. An electrical condenser comprising an active capacity producing stack having armatures protruding from opposite ends thereof, a pair of stiffening backing insulating plates therefor presenting shoulders near the opposite ends thererespective armatures of the stack, each of said of, and sheet metal terminal elements for thev nals including tongues extending across the thickness ot the backing plates at the side edges there- -r of and bent over to exert clamping pressure upon the stack, each ef said terminals including a sheet A metal piece which the ends of said clamping tongues engage, said backing plates presenting terminal anchoring shoulders near the ends thereof engaging the respective outer edges of the locking tongues, each of said terminal plates having an integral upstanding portion engaging the corresponding end of the backing plates.

SAMUEL SIEGEL. 

